US PATENT SUBCLASS 370 / 274
.~ Repeater


Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

273  DF  QUADRUPLEX {2}
274.~ Repeater


DEFINITION

Classification: 370/274

Repeater:

(under subclass 273) Subject matter in which a retransmission station is adapted to quadruplex work.

SEE OR SEARCH THIS CLASS, SUBCLASS:

279, and 293, for a radio and a wire duplex repeater, respectively.

315+, for a repeater used in communication over free space.

492, for a repeater used in multiplex communications over frequency channels.

501, for a repeater used in multiplex communications over time channels.

SEE OR SEARCH CLASS 178, Telegraphy,

70+, for a repeating system other than quadruplex repeater.

330, Amplifiers, appropriate subclasses, particularly

61, for amplifier (one-way repeater).

375, Pulse or Digital Communications,

211+, for a pulse or digital repeater communication system.

379, Telephonic Communications,

338+, for a two way repeater, specific to telephony and acting usually through varying current and contact pressure rather than by current interruptions.

455, Telecommunications,

7+, for analog repeater communication systems.